Acridin dye and process of making same.



NITED STATES Patented October 6, 1903.

PATENT OFFICE.

CHRISTOPHER RIS AND ALBERT MYLIUS, OF BASLE, SWITZERLAND, AS-

SIGNORS TO ANILINE COLOUR AND EXTRACT-WORKS, FORMERLY JOHN R. GEIGY, OF BASLE, SWITZERLAND.

ACRIDIN DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 740,468, dated October 6, 1903.

' Application filed July 28, 1903. Serial No. 167,314. (Specimens) To (0% whom it may concern:

Be it known that we, CHRISTOPHER Bis and ALBERT MYLIUS, citizens of Switzerland, and residents of Basic, Switzerland, have invented certain new and useful Improvements in Acridin' Dyes and Processes of Making Same, of which the following is a specification.

The present invention relates to the production of basic dyestuffs of the acridin se-' ries, especially useful for dyeing cotton or leather mordanted with tannin in orangeyellow, reddish-orange to brown shades, which are to be obtained in a general manner by melting formylated aromatic bases together with a metadiamin and a salt of a base, such as salts of ammonia or of organic bases, the latter serving as agents of condensation.

As formylated bases which may be used for the process, we cite the following: mono or di formylmetaphenylenediamin, mono or di forlylmetatoluylenediamin, formylated alkyl derivates of these metadiamins, formanilid and its homologues, formyl compounds of monoalkylanilinsand of their-homologues, formylated naphthylamins, formyl derivates of amidophenol others, of paradiamins, and of the bases of the benzidin series. However, we do not confine ourselves to this enumeration, because the reaction is of a rather general applicability. All these compounds furnish when brought into reaction with the same metadiamiu compound very similar dyestufis. The metadiamins which may especially be used are the following: metaphenylenediamin, metatoluylenediamin, and their alkyl derivatives. The first named gives brownish-yellow to brown shades, the second orange-yellow shades, while their alkyl derivatesturn to reddish-orange. Goncerning the third component of the reaction it is to be observed that the different agents of condensation-via, salts of bases-do not produce an essentially different result. As useful salts we cite the following, for instance: chlorhydrate of am monia,anilinchlorhydrate, chlorhydrates of toluidins, of naphthylamins, and of metadiamins, as well as other salts of these bases, such as sulfates.

We cannot give an exact formula showing the constitution of thenew coloring-matters.

However, they are different from the known acridin yellow (the formation of which might have been presumed) by a much reddershade, easier solubility, and a weaker fluorescence of their solutions.

The following is an expression of our reaction Formylated base metadiamin salt of a base gives NH +HO +base+salt of an acridin dye.

Example I: 17.8 kilos of dif-ormylated metatoluylenediamin, 24.4 kilos of metatoluylenedia'miu, and 2i kilos of chlorhydrate of anilin are melted together and heated gradually to about 180 centigrade tillthe mass becomes viscous and an augmentation of the intensity of the color can no more be observed. The mass is then left to cool and is finely pulverized. It may directly be employed for dyeing purpose, or purified by dissolving the same with boiling water, filtered and evaporated to dryness, The dyestuff forms a brown powder, easily soluble in water with an orange color, easily soluble in alcohol showing a yellowish-green fluorescence, insoluble in ether and benzene, soluble in concentrated sulfuric acid with a dull yellow color. The watery solution is precipitated by alkalies in light-brown flakes. The coloring matter dyes cotton mordanted with tannin or leather in yellowish-orange shades of great fastness.

Example II: 24.2 kilos of formanilid, for

ty-four kilos of metaphenylenediamin, and forty kilos of salmiac salt are heated together at about 200 to 210 centigrade till the formation of the coloring-matter will be finished. The dyestuff forms a dark-brown powder, soluble in water with an orange-brown color, from which the base of the-color is precipitated by alkalies in brown flakes. The dyestufi is also easily soluble in alcohol with orange-color and dull-greenish fluorescence.

It is insoluble in ether and benzene, soluble temperature till no augmentation of the formation of color may be observed. The dyestufidissolves in water with orange color, precipitated by alkalies in orange-yellow flakes, soluble in alcohol with orange color and green fluorescence, insoluble in ether and benzene, soluble in concentrated sulfuric acid with light-yellow color. It dyes reddish-orange shades.

The described process may be carried out in an enameled-iron vessel furnished with a stirring mechanism and placed'in an oil-bath.

We claim v 1. The process for the production of orange to. brown acridin dyestuffs by melting a formylated aromatic base together with a metadiamin compound and with a salt of a base,

substantially as described.

2. As new articles of manufacture the thus- CHRISTOPHER RIS. ALBERT MYLIUS.

Witnesses:

ALBERT GRAEBER, GEO. GIFFORD. 

